Add startup diagnostics

app.py

@@ -6,6 +6,8 @@ os.environ.setdefault("MPLCONFIGDIR", "/tmp/matplotlib")
 os.environ.setdefault("GRADIO_ANALYTICS_ENABLED", "False")
 os.environ.setdefault("GRADIO_SSR_MODE", "false")
 
+print("codex-traces startup: env configured", flush=True)
+
 import html
 import json
 import math
@@ -18,6 +20,8 @@ from typing import Any
 import gradio as gr
 from huggingface_hub import hf_hub_download, list_repo_files
 
+print("codex-traces startup: imports complete", flush=True)
+
 
 APP_TITLE = "Codex Traces"
 DATASET_REPO = "Mike0021/codex-sessions"
@@ -1160,6 +1164,7 @@ html, body, .gradio-container {
 
 
 def build_app() -> gr.Blocks:
+    print("codex-traces startup: building app", flush=True)
     choices = _session_choices(live=False)
     default = None
     initial_summary, initial_transcript, initial_page_info, initial_page = _initial_view(choices)
@@ -1249,12 +1254,15 @@ def build_app() -> gr.Blocks:
             show_progress="minimal",
         )
 
+    print("codex-traces startup: app built", flush=True)
     return demo
 
 
 demo = build_app()
+print("codex-traces startup: demo ready", flush=True)
 
 if __name__ == "__main__":
+    print("codex-traces startup: launching", flush=True)
     demo.launch(
         theme=gr.themes.Base(
             primary_hue="blue",